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# 5d3dca24 27-Jan-2021 Aaron Ballman <[email protected]>

Ignore unknown attribute warnings in this test

We're testing the parsing behavior, not the actual attributes used, and
the attribute name cannot be elided for __declspec attributes.
# 9f2c7eff 27-Jan-2021 Aaron Ballman <[email protected]>

Parse different attribute syntaxes in arbitrary order

In Clang today, we parse the different attribute syntaxes
(__attribute__, __declspec, and [[]]) in a fairly rigid order. This
leads to confusion

Parse different attribute syntaxes in arbitrary order

In Clang today, we parse the different attribute syntaxes
(__attribute__, __declspec, and [[]]) in a fairly rigid order. This
leads to confusion for users when they guess the order incorrectly,
and leads to bug reports like PR24559 or necessitates changes like
D94788.

This patch adds a helper function to allow us to more easily parse
attributes in arbitrary order, and then updates all of the places
where we would parse two or more different syntaxes in a rigid order to
use the helper method. The patch does not attempt to handle Microsoft
attributes ([]) because those are ambiguous with other code constructs
and we don't have any attributes that use the syntax.

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